EP1115518B1 - Method and device for connecting overlapping flat parts - Google Patents

Method and device for connecting overlapping flat parts Download PDF

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Publication number
EP1115518B1
EP1115518B1 EP99955786A EP99955786A EP1115518B1 EP 1115518 B1 EP1115518 B1 EP 1115518B1 EP 99955786 A EP99955786 A EP 99955786A EP 99955786 A EP99955786 A EP 99955786A EP 1115518 B1 EP1115518 B1 EP 1115518B1
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EP
European Patent Office
Prior art keywords
punch
die
undercut
radius
forming punch
Prior art date
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Expired - Lifetime
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EP99955786A
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German (de)
French (fr)
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EP1115518A1 (en
Inventor
Wolfgang Voelkner
Gerald Effenberg
Reinhard Mauermann
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Technische Universitaet Dresden
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Technische Universitaet Dresden
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Priority claimed from DE19945743A external-priority patent/DE19945743A1/en
Publication of EP1115518A1 publication Critical patent/EP1115518A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/02—Riveting procedures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/03—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
    • B21D39/031—Joining superposed plates by locally deforming without slitting or piercing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/12—Riveting machines with tools or tool parts having a movement additional to the feed movement, e.g. spin
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
    • F16B5/04—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of riveting
    • F16B5/045—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of riveting without the use of separate rivets
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49924—Joining by deforming of parallel side-by-side elongated members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53039—Means to assemble or disassemble with control means energized in response to activator stimulated by condition sensor
    • Y10T29/53061—Responsive to work or work-related machine element
    • Y10T29/53065—Responsive to work or work-related machine element with means to fasten by deformation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53996—Means to assemble or disassemble by deforming

Definitions

  • the invention relates to a method for connecting overlapping plate-shaped Components according to the preamble of claim 1.
  • the invention also relates to a Device for connecting overlapping plate-shaped components after the Preamble of claim 4.
  • DE 40 09 813 C1 discloses a device for connecting overlapping ones known plate-shaped components. With such a device, sheets can be made through the Connect so-called clinching.
  • the special feature of this device is that in A deformable material is provided in the region of the peripheral edge of the recess of the die which is softer than that of the sheets to be joined. This is supposed to be based on a common division of Die are dispensed with.
  • DE 39 23 182 C2 describes a device for connecting one above the other known plate-shaped components with a stamp, in which a split die is used becomes.
  • a base body with complementary conical surfaces is used to support the die parts provided, as well as a return spring for prestressing on the base body in Direction of movement of the stamp.
  • a punch penetrates into the sheets to be connected in a straight line movement during the working stroke, with on the opposite side a fixed or divided die having the shape of the so-called die side of the clinch point.
  • a counter punch is positioned in the divided die.
  • the superimposition of a wobble movement on a joining feed movement is from wobble riveting known from here.
  • the wobble riveting is applied to by partial upsetting and Embossing operations, e.g. on an auxiliary joining part to achieve a positive connection.
  • the object of the invention is to reduce the forces to be applied during clinching. With that the areas of application with regard to high-strength materials and the accessibility of large ones Components with C-brackets can be expanded significantly. The task continues to be the Eliminate weaknesses small neck thickness and small undercut and thus at the same joining task to achieve a higher connection strength. Furthermore, complicated Matrices and the necessary effort for the coaxial positioning of the punch and die if possible omitted.
  • the object is achieved by a method with those mentioned in claim 1 Features resolved.
  • Advantageous variants of the method result from the dependent ones Dependent claims.
  • the object is further achieved by a device with the in claim 4 mentioned features solved.
  • Advantageous configurations result from the in the Claims 5 to 9 mentioned features.
  • a wobbling movement of the forming die and a variable punch force are superimposed on the axial feed movement, the wobbling movement and the variable punch force being controlled in a coordinated manner. While the stamp is wobbling, the stamping force is controlled in such a way that the stamping force increases from the center of the clinching point to the outside during the migration of the contact surface formed between the stamping face and the workpiece, and the stamping force is reduced from outside to inside during the migration of this surface.
  • the material is partially formed by the wobble movement, so that the process forces decrease significantly.
  • the desired material flow is realized radially from the inside out thanks to the variable stamping force.
  • the wobble movement itself can be superimposed on the axial feed movement during the entire joining process or during part of the joining process.
  • a mechanically driven mechanism is provided on the forming die, which makes it tumble. Furthermore, a mechanical, servo-hydraulic, Piezoelectric or the like. Mechanism provided that the die with a variable punch force against the recess of the die. Depending on the The wobble position is determined by the application of the variable stamp force to the form stamp and controlled.
  • the sheets are on a fixed or movable die with or without Counter stamp or only on a smooth anvil.
  • a special geometry of the die is realized in connection with the Tumbling movement at the beginning of the joining process the insertion of more material into the Forming zone.
  • material becomes pressed radially from the bottom area into the neck area and thus from an area in which an accumulation is not necessary, shifted to the neck area, which is essential for the strength of the Connection is crucial.
  • the die has an end shape as radii R1 / R2 and / or as a cone and / or as Trailing curve, the radius R1 being larger than that for a design with pure radii maximum punch diameter and R2 is smaller than the maximum punch diameter.
  • the counter punch has an end shape with either a radius R3 and / or a cone and / or a trailing curve, with a radius R3 is larger than the maximum punch diameter.
  • the shaped stamp advantageously has a stamp undercut on which the maximum Stamp diameter undergoes such a taper that a collision between the shaft of the Form stamp and the cylindrical part of the stamp-side sheet is prevented.
  • a movable die has an undercut on which the inner diameter of the die experiences a taper around the undercut in the joining point to support.
  • a fixed matrix can also be used. This should then be a draft slope with an angle and / or transition curves between the die front and bottom.
  • Fig. 1 the well-known clinching with divided die 4 and counter-punch 5 is shown.
  • the punch 1 penetrates into the sheets 2 and 3 to be connected in an axial movement.
  • the well-known positive locking effect, the so-called undercut 6, is achieved between the joining partners, the process being carried out up to a predetermined residual floor thickness 7 and a neck region 8 being formed as a decisive criterion for the connection strength.
  • the stamp 1a is shown in a deflected position at the end of the forming process.
  • the two sheets 2, 3 are pressed into a split die 4 , which is provided with a die undercut 4a .
  • the forming die 1a tilts by the angle ⁇ and, together with the radii R1 / R2 of the forming die 1a and the counter-die 5 , the remaining bottom thickness 7 is deliberately tapered and the material is displaced radially outward from the bottom region.
  • FIG. 3 shows a path of a wobble movement.
  • the stamping force is reduced during the inward movement 14 in the direction of the center of the point, in extreme cases to zero, with the outward movement 15 a high stamping force F is realized.
  • the punch force F therefore has a larger value with increasing value ⁇ and thus presses the material radially outwards.
  • This variable stamping force is generated mechanically, servohydraulically, piezoelectrically or the like.
  • the resulting special material flow and the die undercut 4a enable a better design of the critical neck area 8 and the undercut 6 .
  • the die undercut 9 of the die 1a is a prerequisite for a horizontally displacement-free process and enables a cylindrical inner contour of the joining point.
  • Fig. 4 the device with a fixed die 10 is shown on the right side of the center line and on the left side with a flat anvil 11 each in the bottom dead center. Again, the material flow achieves a well-formed neck area 8 and an undercut 6 with a small base thickness 7 , the undercut 6a being smaller with a flat anvil 11 but sufficient for many applications.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Control Of Presses (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The invention relates to a method for connecting overlapping flat parts in a mechanical joining process, for example for connecting panels, using a mould stamp (1a) and a matrix which is provided with a recess, the parts to be connected being placed between the mould stamp and the matrix. The invention is characterized in that the active axial advancing movement of the mould stamp (1a) is impressed with a tumbling motion throughout the entire joining process or during a part of the joining process and will a variable stamping force (F) which is dependent on said tumbling motion, in or to produce a flow of material that is oriented towards the undercut (6). The invention also relates to a device for carrying out the inventive method.

Description

Die Erfindung betrifft ein Verfahren zum Verbinden von sich überlappenden plattenförmigen Bauteilen nach dem Oberbegriff des Anspruchs 1. Die Erfindung betrifft außerdem eine Vorrichtung zum Verbinden von sich überlappenden plattenförmigen Bauteilen nach dem Oberbegriff des Anspruchs 4.The invention relates to a method for connecting overlapping plate-shaped Components according to the preamble of claim 1. The invention also relates to a Device for connecting overlapping plate-shaped components after the Preamble of claim 4.

Aus der DE 40 09 813 C1 ist eine Vorrichtung zum Verbinden von sich überlappenden plattenförmigen Bauteilen bekannt. Mit einer derartigen Vorrichtung lassen sich Bleche durch das sogenannte Clinchen verbinden. Die Besonderheit bei dieser Vorrichtung besteht darin, dass im Bereich des Umfangrandes der Ausnehmung der Matrize ein verformbares Material vorgesehen ist, das weicher als das der zu verbindenden Bleche ist. Damit soll auf eine übliche Teilung der Matrize verzichtet werden.DE 40 09 813 C1 discloses a device for connecting overlapping ones known plate-shaped components. With such a device, sheets can be made through the Connect so-called clinching. The special feature of this device is that in A deformable material is provided in the region of the peripheral edge of the recess of the die which is softer than that of the sheets to be joined. This is supposed to be based on a common division of Die are dispensed with.

Aus der DE 39 23 182 C2 ist eine Vorrichtung zum Verbinden von übereinander angeordneten plattenförmigen Bauteilen mit einem Stempel bekannt, bei der eine geteilte Matrize verwendet wird. Zur Lagerung der Matrizenteile ist ein Grundkörper mit komplementären Kegelflächen vorgesehen, sowie eine Rückholfeder zur Vorspannung auf dem Grundkörper in Bewegungsrichtung des Stempels.DE 39 23 182 C2 describes a device for connecting one above the other known plate-shaped components with a stamp, in which a split die is used becomes. A base body with complementary conical surfaces is used to support the die parts provided, as well as a return spring for prestressing on the base body in Direction of movement of the stamp.

Beim Clinchen, unter Verwendung von Vorrichtungen nach DE 40 09 813 C1 oder DE 39 23 182 C2, dringt ein Stempel beim Arbeitshub in einer geradlinigen Bewegung in die zu verbindenden Bleche ein, wobei auf der Gegenseite eine feste oder geteilte Matrize die Form der sogenannten Matrizenseite des Clinchpunktes mit ausbildet. In der geteilten Matrize wird ein Gegenstempel positioniert.
Mit dem Einbringen der Vertiefung durch die Werkzeuge wird neben dem Kraftschluss der bekannte Formschlusseffekt, die sogenannte Hinterschneidung, zwischen den Fügepartnern erzielt, wobei der Vorgang bis zu einer vorgegebenen Bodendicke durchgeführt wird.When clinching, using devices according to DE 40 09 813 C1 or DE 39 23 182 C2, a punch penetrates into the sheets to be connected in a straight line movement during the working stroke, with on the opposite side a fixed or divided die having the shape of the so-called die side of the clinch point. A counter punch is positioned in the divided die.
With the introduction of the recess through the tools, in addition to the frictional connection, the known positive locking effect, the so-called undercut, is achieved between the joining partners, the process being carried out up to a predetermined base thickness.

Nachteilig ist, dass beim bekannten Clinchen hohe Kräfte benötigt werden. Deshalb sind die Werkzeug- und Werkzeuggestellbelastungen hoch und schränken die Anwendung bei hochfesten Blechen ein. The disadvantage is that the known clinching requires high forces. That's why they are Tool and tool rack loads are high and limit the application for high-strength Sheet metal.

Durch die hohen Fügekräfte werden bei der Notwendigkeit genauer koaxialer Ausrichtung zwischen Stempel und Matrize große Anforderungen an die Führung der Werkzeuge gestellt.
Für die überwiegend als Werkzeuggestell eingesetzten C-Bügel wird mit hohen Kräften die Ausladung und damit die Anwendbarkeit des Verfahrens eingegrenzt.
Durch die geradlinige Stempelbewegung wird die Dicke des stempelseitigen Bleches im sogenannten Halsbereich stark verjüngt und der Hinterschnitt nur gering ausgebildet, wodurch die Verbindungsfestigkeit begrenzt wird.The high joining forces make great demands on the guidance of the tools when precise coaxial alignment between the punch and the die is necessary.
For the C-frame, which is mainly used as a tool frame, the throat and thus the applicability of the process are limited with high forces.
Due to the straight stamp movement, the thickness of the stamp-side sheet in the so-called neck area is greatly tapered and the undercut is made only slightly, which limits the connection strength.

Die Überlagerung einer Taumelbewegung zu einer Fügevorschubbewegung ist vom Taumelnieten her bekannt. Das Taumelnieten wird angewandt, um durch partielle Stauch- und Prägeoperationen, z.B. an einem Hilfsfügeteil, eine formschlüssige Verbindung zu erzielen.The superimposition of a wobble movement on a joining feed movement is from wobble riveting known from here. The wobble riveting is applied to by partial upsetting and Embossing operations, e.g. on an auxiliary joining part to achieve a positive connection.

Aufgabe der Erfindung ist es, die beim Clinchen aufzubringenden Kräfte zu senken. Damit sollen die Anwendungsgebiete bezüglich hochfester Werkstoffe und die Zugänglichkeit bei großen Bauteilen mit C-Bügeln wesentlich erweitert werden. Die Aufgabe besteht weiterhin darin, die Schwachstellen geringe Halsdicke und geringer Hinterschnitt zu beseitigen und damit bei der gleichen Fügeaufgabe eine höhere Verbindungsfestigkeit zu erreichen. Ferner sollen komplizierte Matrizen und der notwendige Aufwand zum koaxialen Positionieren von Stempel und Matrize nach Möglichkeit entfallen.The object of the invention is to reduce the forces to be applied during clinching. With that the areas of application with regard to high-strength materials and the accessibility of large ones Components with C-brackets can be expanded significantly. The task continues to be the Eliminate weaknesses small neck thickness and small undercut and thus at the same joining task to achieve a higher connection strength. Furthermore, complicated Matrices and the necessary effort for the coaxial positioning of the punch and die if possible omitted.

Erfindungsgemäss wird die Aufgabe durch ein Verfahren mit den im Anspruch 1 genannten Merkmalen gelöst. Vorteilhafte Varianten des Verfahrens ergeben sich aus den abhängigen Unteransprüchen. Die Aufgabe wird weiterhin durch eine Vorrichtung mit den im Anspruch 4 genannten Merkmalen gelöst. Vorteilhafte Ausgestaltungen ergeben sich aus den in den Ansprüchen 5 bis 9 genannten Merkmalen.According to the invention, the object is achieved by a method with those mentioned in claim 1 Features resolved. Advantageous variants of the method result from the dependent ones Dependent claims. The object is further achieved by a device with the in claim 4 mentioned features solved. Advantageous configurations result from the in the Claims 5 to 9 mentioned features.

Bei dem Verfahren wird der axialen Vorschubbewegung eine taumelnde Bewegung des Formstempels und eine variable Stempelkraft überlagert, wobei die taumelnde Bewegung und die variable Stempelkraft aufeinander abgestimmt gesteuert werden.
Während der Stempel eine Taumelbewegung ausführt, wird die Stempelkraft so gesteuert, dass während der Wanderung der zwischen Stempelstirn und Werkstück gebildeten Kontaktfläche vom Mittelpunkt des Clinchpunktes nach außen die Stempelkraft erhöht und während der Wanderung dieser Fläche von außen nach innen die Stempelkraft verringert wird. In the method, a wobbling movement of the forming die and a variable punch force are superimposed on the axial feed movement, the wobbling movement and the variable punch force being controlled in a coordinated manner.
While the stamp is wobbling, the stamping force is controlled in such a way that the stamping force increases from the center of the clinching point to the outside during the migration of the contact surface formed between the stamping face and the workpiece, and the stamping force is reduced from outside to inside during the migration of this surface.

Durch die Taumelbewegung wird der Werkstoff partiell umgeformt, so dass die Prozesskräfte deutlich sinken. Durch die variable Stempelkraft wird der gewünschte Werkstofffluss radial von innen nach außen realisiert.
Die Taumelbewegung selbst kann während des ganzen Fügeprozesses oder während eines Teiles des Fügeprozesses der axialen Vorschubbewegung überlagert sein.The material is partially formed by the wobble movement, so that the process forces decrease significantly. The desired material flow is realized radially from the inside out thanks to the variable stamping force.
The wobble movement itself can be superimposed on the axial feed movement during the entire joining process or during part of the joining process.

Vorrichtungsgemäß ist am Formstempel ein mechanisch angetriebener Mechanismus vorgesehen, der diesen in eine Taumelbewegung versetzt. Weiterhin ist ein mechanisch, servohydraulisch, piezoelektrisch o. dgl. angetriebener Mechanismus vorgesehen, der den Formstempel mit einer variablen Stempelkraft gegen die Ausnehmung der Matrize vorschiebt. In Abhängigkeit von der Taumellage wird die Beaufschlagung des Formstempels mit der variablen Stempelkraft ermittelt und gesteuert.According to the device, a mechanically driven mechanism is provided on the forming die, which makes it tumble. Furthermore, a mechanical, servo-hydraulic, Piezoelectric or the like. Mechanism provided that the die with a variable punch force against the recess of the die. Depending on the The wobble position is determined by the application of the variable stamp force to the form stamp and controlled.

Auf der Gegenseite liegen die Bleche auf einer festen oder beweglichen Matrize mit oder ohne Gegenstempel oder aber nur auf einem glatten Amboss auf.On the opposite side, the sheets are on a fixed or movable die with or without Counter stamp or only on a smooth anvil.

Eine spezielle Geometrie des Formstempels realisiert im Zusammenhang mit der Taumelbewegung am Beginn des Fügeprozesses den Einzug von mehr Material in die Umformzone. Während der Umformung und vor allem am Ende des Vorganges wird Material radial aus dem Bodenbereich in den Halsbereich gedrückt und damit aus einem Gebiet, in dem eine Anhäufung nicht notwendig ist, in den Halsbereich verlagert, der für die Festigkeit der Verbindung ausschlaggebend ist.A special geometry of the die is realized in connection with the Tumbling movement at the beginning of the joining process the insertion of more material into the Forming zone. During the forming process and especially at the end of the process, material becomes pressed radially from the bottom area into the neck area and thus from an area in which an accumulation is not necessary, shifted to the neck area, which is essential for the strength of the Connection is crucial.

Dazu besitzt der Formstempel eine Stirnform als Radien R1/R2 und/oder als Kegel und/oder als Schleppkurve, wobei bei einer Ausbildung mit reinen Radien der Radius R1 größer ist als der maximale Stempeldurchmesser und R2 kleiner ist als der maximale Stempeldurchmesser.For this purpose, the die has an end shape as radii R1 / R2 and / or as a cone and / or as Trailing curve, the radius R1 being larger than that for a design with pure radii maximum punch diameter and R2 is smaller than the maximum punch diameter.

Der Gegenstempel weist eine Stirnform aus entweder mit einem Radius R3 und/oder einem Kegel und/oder einer Schleppkurve, wobei bei einer Ausbildung mit reinem Radius der Radius R3 größer ist als der maximale Stempeldurchmesser. The counter punch has an end shape with either a radius R3 and / or a cone and / or a trailing curve, with a radius R3 is larger than the maximum punch diameter.

Vorteilhaft besitzt der Formstempel eine Stempelhinterschneidung, an welcher der maximale Stempeldurchmesser eine solche Verjüngung erfährt, dass eine Kollision zwischen dem Schaft des Formstempels und dem zylinderförmigen Teil des stempelseitigen Bleches verhindert wird.The shaped stamp advantageously has a stamp undercut on which the maximum Stamp diameter undergoes such a taper that a collision between the shaft of the Form stamp and the cylindrical part of the stamp-side sheet is prevented.

Es ist von Vorteil, wenn eine bewegliche Matrize einen Matrizenhinterschnitt besitzt, an welchem der Matrizeninnendurchmesser eine Verjüngung erfährt, um die Hinterschneidung im Fügepunkt zu unterstützen.It is advantageous if a movable die has an undercut on which the inner diameter of the die experiences a taper around the undercut in the joining point to support.

Es kann auch eine feste Matrize verwendet werden. Diese sollte dann eine Ausformungsschräge mit einem Winkel und/oder Übergangskurven zwischen Matrizenstirn und -grund besitzen.A fixed matrix can also be used. This should then be a draft slope with an angle and / or transition curves between the die front and bottom.

Die Erfindung wird nachfolgend an Hand von Ausführungsbeispielen noch näher erläutert. In den Zeichnungen zeigen:

  • Fig. 1 das bekannte Clinchen mit geteilter Matrize und Gegenstempel
  • Fig. 2 einen Formstempel in ausgelenkter Lage am Ende des Umformvorganges
  • Fig. 3 eine Bewegungsbahn der Kontaktfläche zwischen Stempelstim und Werkstoff
  • Fig. 4 eine Vorrichtung mit fester Matrize und flachem Amboss
    • The invention is explained in more detail below on the basis of exemplary embodiments. The drawings show:
  • Fig. 1 the well-known clinching with a divided die and counter-punch
  • Fig. 2 is a die in a deflected position at the end of the forming process
  • Fig. 3 shows a path of movement of the contact surface between the stamp and material
  • Fig. 4 shows a device with a fixed die and a flat anvil

    • In Fig. 1 ist das bekannte Clinchen mit geteilter Matrize 4 und Gegenstempel 5 dargestellt. Der Stempel 1 dringt in einer axialen Bewegung in die zu verbindenden Bleche 2 und 3 ein.
    Mit dem Einbringen der Vertiefung durch die Werkzeuge wird neben dem Kraftschluss der bekannte Formschlusseffekt, die sogenannte Hinterschneidung 6, zwischen den Fügepartnern erzielt, wobei der Vorgang bis zu einer vorgegebenen Restbodendicke 7 durchgeführt wird und sich ein Halsbereich 8 als entscheidendes Kriterium für die Verbindungsfestigkeit bildet.    In Fig. 1 the well-known clinching with divided die 4 and counter-punch 5 is shown. The punch 1 penetrates into the sheets 2 and 3 to be connected in an axial movement.
    With the introduction of the recess through the tools, in addition to the frictional connection, the well-known positive locking effect, the so-called undercut 6, is achieved between the joining partners, the process being carried out up to a predetermined residual floor thickness 7 and a neck region 8 being formed as a decisive criterion for the connection strength.

    In Fig. 2 ist der Formstempel 1a in ausgelenkter Lage am Ende des Umformvorganges dargestellt. Die beiden Bleche 2, 3 werden in eine geteilte Matrize 4 gepresst, die mit einem Matrizenhinterschnitt 4a versehen ist.2, the stamp 1a is shown in a deflected position at the end of the forming process. The two sheets 2, 3 are pressed into a split die 4 , which is provided with a die undercut 4a .

    Bei der Taumelbewegung kippt der Formstempel 1a um den Winkel α und gemeinsam mit den Radien R1 / R2 von Formstempel 1a und Gegenstempel 5 wird die Restbodendicke 7 gezielt verjüngt und das Material aus dem Bodenbereich radial nach außen verdrängt. During the wobble movement, the forming die 1a tilts by the angle α and, together with the radii R1 / R2 of the forming die 1a and the counter-die 5 , the remaining bottom thickness 7 is deliberately tapered and the material is displaced radially outward from the bottom region.

    In Fig. 3 ist eine Bahn einer Taumelbewegung dargestellt. Bei der Bewegung des Formstempels in Form einer Rosette wird der Mittelpunkt des Clinchpunktes 13 mehrfach durchlaufen. Bei der nach innen, Richtung Zentrum des Punktes verlaufenden Bewegung 14 wird die Stempelkraft verringert, im Extremfall bis auf Null, bei der nach außen gerichteten Bewegung 15 wird eine hohe Stempelkraft F realisiert.
    Die Stempelkraft F hat also bei steigendem Wert α einen größeren Wert und presst so den Werkstoff radial nach außen. Diese variable Stempelkraft wird mechanisch, servohydraulisch, piezoelektrisch o. dgl. erzeugt.
    Der entstehende spezielle Werkstofffluss und der Matrizenhinterschnitt 4a ermöglichen eine bessere Ausbildung des kritischen Halsbereiches 8 und der Hinterschneidung 6.    3 shows a path of a wobble movement. When moving the die in the form of a rosette, the center of the clinching point 13 is run through several times. The stamping force is reduced during the inward movement 14 in the direction of the center of the point, in extreme cases to zero, with the outward movement 15 a high stamping force F is realized.
    The punch force F therefore has a larger value with increasing value α and thus presses the material radially outwards. This variable stamping force is generated mechanically, servohydraulically, piezoelectrically or the like.
    The resulting special material flow and the die undercut 4a enable a better design of the critical neck area 8 and the undercut 6 .

    Die Stempelhinterschneidung 9 des Formstempels 1a ist Voraussetzung für einen horizontal verschiebungsfreien Vorgang und ermöglicht eine zylindrische Innenkontur des Fügepunktes.The die undercut 9 of the die 1a is a prerequisite for a horizontally displacement-free process and enables a cylindrical inner contour of the joining point.

    In Fig. 4 wird auf der rechten Seite der Mittellinie die Vorrichtung mit fester Matrize 10 und auf der linken Seite mit flachem Amboss 11 jeweils im unteren Totpunkt gezeigt.
    Wiederum wird durch den Werkstofffluss ein gut ausgebildeter Halsbereich 8 und eine Hinterschneidung 6 bei geringer Bodendicke 7 erzielt, wobei die Hinterschneidung 6a bei flachem Amboss 11 geringer aber für viele Einsatzfälle ausreichend ist.     In Fig. 4, the device with a fixed die 10 is shown on the right side of the center line and on the left side with a flat anvil 11 each in the bottom dead center.
    Again, the material flow achieves a well-formed neck area 8 and an undercut 6 with a small base thickness 7 , the undercut 6a being smaller with a flat anvil 11 but sufficient for many applications.

    BezugszeichenlisteLIST OF REFERENCE NUMBERS

    1 -1 -
    Stempelstamp
    1a -1a -
    Formstempelforming punch
    2 -2 -
    Blechsheet
    3 -3 -
    Blechsheet
    4 -4 -
    Matrizedie
    4a -4a -
    MatrizenhinterschnittMatrizenhinterschnitt
    5 -5 -
    Gegenstempelcounterpunch
    6 -6 -
    Hinterschneidungundercut
    6a -6a -
    Hinterschneidungundercut
    7 -7 -
    RestbodendickeBottom thickness
    8 -8th -
    Halsbereichneck
    9 -9 -
    StempelhinterschneidungStempelhinterschneidung
    10 -10 -
    Matrizedie
    11 -11 -
    Ambossanvil
    12 -12 -
    Aushebeschräge der MatrizeLift-out bevels of the die
    13 -13 -
    Mittelpunkt des ClinchpunktesCenter of the clinch point
    14 -14 -
    nach innen, Richtung Zentrum des Punktes verlaufende Bewegunginward movement towards the center of the point
    15 -15 -
    nach außen gerichtete Bewegungoutward movement
    F -F -
    variable Stempelkraftvariable stamping force
    R1 -R1 -
    Radius am StempelRadius on the stamp
    R2 -R2 -
    Radius am StempelRadius on the stamp
    R3 -R3 -
    Radius am GegenstempelRadius at the counter stamp

    Claims (9)

    1. Method for connecting overlapping flat parts in a mechanical joining process, e.g. of sheets, using a forming punch (1a) and a die (4) provided with a recess between which the parts to be joined (2, 3) are positioned characterized in that the active axial feeding movement of the forming punch (1a) is superimposed with an orbital motion during the whole joining process or during a portion of the joining process and a varying punch force (F) dependent on the orbital motion so that a material flow directed to the undercut (6) is produced.
    2. Method to Claim 1 characterized in that the orbital motion of the forming punch (1a) is performed under a variable angle (α).
    3. Method to Claim 1 or 2 characterized in that the varying punch force (F) increases with an increasing angle (α) and decreases with a decreasing angle (α).
    4. Device for connecting overlapping flat parts in a mechanical joining process, e.g. of sheets, using a displaceable forming punch (1a) and a die (4) provided with a recess between which the parts to be joined (2, 3) can be positioned characterized in that a mechanically powered mechanism is provided which gives the forming punch (1a) an orbital motion, another mechanism powered mechanically, servohydraulically, piezoelectrically or otherwise, is provided which feeds the forming punch (1a) with a variable punch force (F) against the recess of the die (4), whereby the value of the punch force (F) can be controlled depending on the orbital position.
    5. Device to Claim 4 characterized in that the forming punch (1a) has a front end formed as radii (R1/R2) and/or a taper and/or a tractrix curve, whereby if shaped with radii only the radius (R1) is bigger than the maximum punch diameter and the radius (R2) is smaller than the maximum punch diameter.
    6. Device to Claim 4 or 5 characterized in that a counterpunch (5) is provided which has a front end formed as a radius (R3) and/or a taper and/or a tractrix curve, whereby if shaped with a radius (R3) only, said radius is bigger than the maximum punch diameter.
    7. Device to any of the Claims 4 to 6 characterized in that the forming punch (1a) has a punch undercut (9) where the maximum punch diameter is tapered such that a collision between the shank of the forming punch (1a) and the cylindrical portion of the punch-side sheet is prevented.
    8. Device to any of the Claims 4 to 7 characterized in that a movable die (4) is provided having a die undercut (4a) at which the die interior diameter is tapered to support the undercut at the joining spot.
    9. Device to any of the Claims 4 to 8 characterized in that a fixed die (10) is provided having a draft (12) with an angle and/or transition curves between the die head and die bottom.
    EP99955786A 1998-09-25 1999-09-24 Method and device for connecting overlapping flat parts Expired - Lifetime EP1115518B1 (en)

    Applications Claiming Priority (5)

    Application Number Priority Date Filing Date Title
    DE19843874 1998-09-25
    DE19843874 1998-09-25
    PCT/DE1999/003064 WO2000018528A1 (en) 1998-09-25 1999-09-24 Method and device for connecting overlapping flat parts
    DE19945743 1999-09-24
    DE19945743A DE19945743A1 (en) 1998-09-25 1999-09-24 Method and device for connecting overlapping plate-shaped components

    Publications (2)

    Publication Number Publication Date
    EP1115518A1 EP1115518A1 (en) 2001-07-18
    EP1115518B1 true EP1115518B1 (en) 2003-03-19

    Family

    ID=26049065

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP99955786A Expired - Lifetime EP1115518B1 (en) 1998-09-25 1999-09-24 Method and device for connecting overlapping flat parts

    Country Status (5)

    Country Link
    US (1) US6473957B1 (en)
    EP (1) EP1115518B1 (en)
    JP (1) JP2002525208A (en)
    AT (1) ATE234696T1 (en)
    WO (1) WO2000018528A1 (en)

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    DE19927103A1 (en) * 1999-06-14 2000-12-21 Univ Dresden Tech Method, device and auxiliary joining part for mechanical joining
    JP4746785B2 (en) * 2001-07-17 2011-08-10 本田技研工業株式会社 Metal plate joining equipment
    DE10213793A1 (en) * 2002-03-27 2003-10-09 Fraunhofer Ges Forschung Method, device and auxiliary joining part for joining at least two components
    US20050177993A1 (en) * 2002-05-08 2005-08-18 Bergkvist Hans R. Method for mechanically joining two or more layers of sheet material
    JP3726786B2 (en) * 2002-07-31 2005-12-14 マツダ株式会社 Joining method and joining tool
    JP3864888B2 (en) * 2002-10-28 2007-01-10 マツダ株式会社 Joining method using friction stir
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    US8533928B2 (en) * 2004-04-28 2013-09-17 Profil Verbindungstechnik Gmbh & Co., Kg Method and apparatus for the attachment of a fastener element to a component, in particular to a sheet metal part
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    CN100341639C (en) * 2005-11-30 2007-10-10 天津理工大学 Split die for processing rapid connection structure
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    Also Published As

    Publication number Publication date
    US6473957B1 (en) 2002-11-05
    EP1115518A1 (en) 2001-07-18
    WO2000018528A1 (en) 2000-04-06
    ATE234696T1 (en) 2003-04-15
    JP2002525208A (en) 2002-08-13

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